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the interface circuitry in the generator. The following are descriptions of the signal
types used in the RFG 5500 .
Analog Outputs
Analog Input
Digital Outputs
Digital Input
Interlock
P/N 5706045C
RFG 5500 GENERATOR WITH DISPLAY
The analog readback signals from the generator
(
and
) are driven by precision, low-offset
pins 2
3
operational amplifiers (industry type OP200GP).
These devices are capable of driving high-
capacitance loads such as those expected in shielded
interface applications. The user's receiver must
Ω
present a 10 k
(or greater) impedance to these
signals. The readback signals, which represent the
forward and reflected power as measured at the
output of the generator, are scaled to 1 V per kW.
The setpoint signal from the user (
volt signal scaled to represent the desired forward
power from the generator (refer to the signal
description table for details). The driver circuit must
be capable of operating into a high capacitance load
condition (cable capacitance plus 1000 pF at the
EMI filter in the generator).
The status signals provided by the generator (
and
) are opto-coupled with NPN transistor outputs
7
(industry type 4N37). The emitter of each transistor
is biased to ground with a 2 k
collector of each transistor is tied to +5.1 V in the
generator. Each transistor can provide a minimum
of 8 mA of collector current and may be operated
with a collector-to-emitter voltage of up to 30 V.
Refer to the attached signal description table for
signal definitions.
The RF PWR ON control signal (
coupled (industry type 4N37). The user's signal
drives the LED in the opto-coupler through a 1 k
resistor. A signal level of 4 V to 30 V applied to
pin 4
enables the RF power.
The interlock signal (
pin 11
(industry type MOC207). The anode of the LED in
the opto-coupler is tied to +15 V in the generator
Ω
through a 475
resistor. The user's signal is tied to
the cathode. Grounding
Ω
of less than 1.2 k
ohms) energizes the contactor
that enables ac power within the generator.
December 2000
) is a 0 to 10
pin 5
pins 1
Ω
resistor. The
) is opto-
pin 4
) is opto-coupled
pin 11
(contact resistance
Ω
2-3
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